Wow. What complicated emissions testing you have.
Our UK W124, petrol powered, has just been emissions tested under the new and tightened up Euro regulations.
On the pre cat car the CO was 0.21% (max allowed 3.5%) and HC 127 ppm (max is 200 ppm, I think). Nox is not measured and the emissions test is only measured at natural idle and fast idle (approximating 70 mph in engine speed). Last year the CO was 18% at idle , but was tweaked down with a mixture adjustment.